FIELD: communication.
SUBSTANCE: invention relates to key update means. A terminal device performs access to the main network device, using both the first access technology and the second access technology at the same time. The main network device performs repeated authentication on the terminal device via the first connection corresponding to the first access technology, and, if a start condition is met, the main network device updates the key for the second connection corresponding the second access technology.
EFFECT: provision of update of NAS key in a process, in which AMF node performs repeated authentication on a terminal device, using one access technology, which impacts on normal communication, which is performed between the terminal device and AMF node, using another access technology.
24 cl, 17 dwg
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